As a first example of the sturdiness of the shell model we look at the work of Ruiz et al. [1]} on measurements and theoretical analysis quadrupole moments of odd A nuclei in the “f-p” region. They measured the quadruple moments of the \(J=7/2^{-}\)  ground states of Calcium isotopes with \(A=43,45,47\)  which have ground state spins \(J=7/2^{-}\) . They did not do \(A=41\)  but this case could be obtained from another source. They also obtained results for \(A=49,51\)  with \(J=3/2^{-}\)  spins.
